Three cards are drawn from a deck of 52 playing cards and not replaced. Find the probability of the following:

a). Getting three jacks
b). Getting an ace, a king, and a spade in that order.
c). Getting a club, a spade and a heart in that order.
d). Getting three clubs.

HELP!

a)P(3J)= (4/52)*(3/51)*(2/50)

b)P(A+K+S)= ((4/42)*(4/51)*(13/50))+((4/52)*(4/51)*(12/50))+((4/52)*(4/51)*(11/50))

c)(13/52)*(12/51)*(11/50)